Importance of the aromatic ring in adrenergic amines. 7. Comparison of the stereoselectivity of norepinephrine N-methyltransferase for aromatics. Nonaromatic substrates and inhibitors
作者:Michael F. Rafferty、David S. Wilson、James A. Monn、Polina Krass、Ronald T. Borchardt、Gary L. Grunewald
DOI:10.1021/jm00352a020
日期:1982.10
the lipophilicity of the nonaromatic ethanolamine analogues was increased, a loss in both stereoselectivity and substrate activity occurred. The results presented here are consistent with an aromatic ring binding site that is part of, or bordered by, a large hydrophobic area. The larger, more hydrophobic nonaromatic phenylethanolamine derivatives are drawn into the hydrophobic area, which reduces side-chain
制备了苯丙胺和α-甲基苄基胺的一些非芳族类似物,并将其评价为去甲肾上腺素N-甲基转移酶(NMT)的竞争性抑制剂。所有的非芳香族类似物均比其芳香族类似物具有更高的活性[苯丙胺的Ki = 740 microM;1-环辛基-2-氨基丙烷的Ki =86μM。为了确定这些类似物的脂族环是否与苯丙胺和α-甲基苄胺的苯环结合在相同的结合位点,确定了NMT对不同化合物的立体选择性。芳香族和非芳香族抑制剂的立体化学要求是相似的(在所有情况下,S异构体在抑制NMT方面更有效)。还发现,对苯乙醇胺底物和相应的非芳族类似物表达的立体化学偏好相同。然而,随着非芳族乙醇胺类似物的亲脂性增加,立体选择性和底物活性均发生损失。此处显示的结果与芳香环结合位点一致,该位点是大疏水区域的一部分或边界。更大,更疏水的非芳族苯基乙醇胺衍生物被引入疏水区域,从而减少了底物活性所需的侧链羟基相互作用。此处显示的结果与芳香环结合位点一致